This does not yet include AV's latest tweaks (M3 above) - however the differences for most applications should be quite minor. The other (written by A.V.) takes theĪ python version has now also been written by Matthew Partridge at Cranfield University. A higher VI oil might increase operating temperature range or oil life, but are typically more expensive.
This calculator will tell you the viscosity index of your oil, so you can be sure it will function across the entire temperature range. One takes volume fraction of glycerine as input. Viscosity changes with temperature, and Viscosity Index (VI) tells you how much. Further refinements from Andreas Volk to density of pure water, and the temperature-dependence of the contraction of the mixture. In both cases the fit was chosen to match data from Gregory (table 3 and 7) Andreas Volk pointed out that the density calculation can be made more accurate by (i) accounting for the volume contraction of the mixture (ii) adjusting the fit for the density of pure glycerine as a function of temperature. Thanks to Paul Debue for pointing this out. The mixture should use the glycerine fraction by VOLUME and not by mass. Density calculation has been changed: equation 25 in Cheng's paper to compute the density of I'd recommend reading the latter paper first. Kähler (2018) Experiments in Fluids 59 75. Youll also explore the reasons why viscosity is. 47 3285-3288, with a number of adjustments (see below), which are described in Volk and In this article, you will learn what viscosity is, how it is measured, and the viscosity equation of a fluid. The calculation is based on the parameterisation in Cheng (2008) Ind. Calculate density and viscosity of glycerol/water mixturesĭynamic viscosity of mixture is :
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